Sun worshippers beware: tanning may be addictive!

The researchers shaved the backs of the mice and gave them a daily dose of UV light (enough to induce tanning but not burning) for six weeks. The study found that bloodstream endorphin levels rose within a week, and regular exposure to UV radiation led to physical dependence and addictive behaviour in the mice. The animals even exhibited withdrawal symptoms (shaking, tremors and teeth chattering) after being treated with a drug that blocked the endorphin activity. Although the study involved laboratory mice, the researchers said they believe the findings were applicable to humans because the biological response of human skin to UV radiation is similar. In theory, sun-related skin cancer should be highly preventable merely by reducing exposure, but the addictive qualities of UV exposure may help explain the "sun-seeking behaviour" some people display through outdoor and indoor tanning and other pursuits despite the known risks. Fell GL, Robinson KC et al. Skin β-endorphin mediates addiction to UV light. Cell 2014; 157:1527-34.

Sun worshippers beware: tanning may be addictive!

The researchers shaved the backs of the mice and gave them a daily dose of UV light (enough to induce tanning but not burning) for six weeks. The study found that bloodstream endorphin levels rose within a week, and regular exposure to UV radiation led to physical dependence and addictive behaviour in the mice. The animals even exhibited withdrawal symptoms (shaking, tremors and teeth chattering) after being treated with a drug that blocked the endorphin activity.

Although the study involved laboratory mice, the researchers said they believe the findings were applicable to humans because the biological response of human skin to UV radiation is similar. In theory, sun-related skin cancer should be highly preventable merely by reducing exposure, but the addictive qualities of UV exposure may help explain the "sun-seeking behaviour" some people display through outdoor and indoor tanning and other pursuits despite the known risks.

Fell GL, Robinson KC et al. Skin β-endorphin mediates addiction to UV light. Cell 2014; 157:1527-34.